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Message: <blockquote data-quote="Purple97GT" data-source="post: 190757" data-attributes="member: 9882">I went through a similar episode chasing this same type of problem for years, and lost a motor on nitrous because of it.This is what happened.I was swapped to a 5 speed from an auto, installed nitrous, and installed a new Walbro 190lph intank fuel pump at the same time to make it to the WFC at Route66. I was tired from working 12-15hrs a day and working on my car for hours, taking a nap and going back to work, so I made a big mistake.I went inside to take a nap between the fuel pump install. I stuck the fuel pump in the tank and barely turned the lock ring to keep dirt and stuff out. I was going to put it all back together after the nap. But when I woke up, I forgot about the lock ring not being turned all the way and bolted it back up.For a long time I had a stumble, miss, jerk, loss of power, hesitation - whatever of those you want to call it and part throttle lugging around and even at WOT. I thought I had it fixed once and ran the nitrous only to blow the motor when it went lean. I thought this was from my LT's having the O2 sensor far away, I thought I had bad ignition problem, a short, you name it and I chased my tail trying to find and fix it!Long story short, after the PI swap I still had the problem. I was pissed off bad. Then one day I was driving with the windows down with my g/f and kept smelling raw fuel. My next off day I started sniffing around the car with motor on and off. I smelled gas real strong around the tank, so I unbolted the SOB and could see where the fuel had been sloshing out of the half locked down ring that holds the fuel pump in. I cleaned it up, locked it down, bolted it back up and the car has run great ever since.So my thinking is when you dropped your tank, you either left the filler neck loose, knocked a vacuum line loose, or something causing a vacuum leak at the fuel tank. Take it all back apart and recheck everything. Think about it, you never had the problem until you dropped the tank to work on it. I only wish I had been smart enough to go back and drop my tank back when my problems started. I would've had time to build a badass PI instead of rushing to stick a stock PI in to geet my car back on the road. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" /></blockquote>